HH Scott LT-112 fm stereo tuner updated NOt working FoR REPAIR

Description

lt112 fm stereo tuner, 120 vac, project on its way with nice updates will need a proper tune and maybe some trouble shooting, as is no returns
1. was working fine with one audio channel intermittent, had parts upgraded and still worked fine with one channel intermittent, then had a tune attempt, now it needs to be tuned professionally. all of the tuning pots work and turn.
2. has nice updates, coax connector added, stereo light works, new transistors, IEC plug an 3 prong cord, power supply updated, again all the updates that were performed and the intermittent channel issue remained the same, the upgraded parts did not introduce any 'new' problems, the tune attempt did.
3. comes with black white copy of manual and tune instructions.
4. will be packed very well
5.
As is no returns
0
thank you